llvmpipe: Fix geometry shader token leak.

Trivial. Matches softpipe's code.

src/gallium/drivers/llvmpipe/lp_state_gs.c

@@ -99,6 +99,7 @@ llvmpipe_delete_gs_state(struct pipe_context *pipe, void *gs)
 
    draw_delete_geometry_shader(llvmpipe->draw,
                                (state) ? state->draw_data : 0);
+   FREE( (void *)state->shader.tokens );
    FREE(state);
 }